<template>
   <div class="app-container">
     <!-- 输入表单 -->
     <el-form label-width="120px">
       <el-form-item label="讲师名称">
         <el-input v-model="teacher.name" />
       </el-form-item>
       <el-form-item label="入驻时间">
         <el-date-picker v-model="teacher.joinDate" value-format="yyyy-MM-dd" />
       </el-form-item>
       <el-form-item label="讲师排序">
         <el-input-number v-model="teacher.sort" :min="0"/>
       </el-form-item>
       <el-form-item label="讲师头衔">
         <el-select v-model="teacher.level">
           <!--
             数据类型一定要和取出的json中的一致，否则没法回填
             因此，这里value使用动态绑定的值，保证其数据类型是number
             -->
           <el-option :value="1" label="高级讲师"/>
           <el-option :value="0" label="首席讲师"/>
         </el-select>
       </el-form-item>
       <el-form-item label="讲师简介">
         <el-input v-model="teacher.intro"/>
       </el-form-item>
       <el-form-item label="讲师资历">
         <el-input v-model="teacher.career" :rows="10" type="textarea"/>
       </el-form-item>

       <!-- 讲师头像 -->
       <el-form-item label="讲师头像">
         <el-upload
           :show-file-list="false"
           :on-success="handleAvatarSuccess"
           :before-upload="beforeAvatarUpload"
           :on-error="handleAvatarError"
           :action="BASE_URL+`/file/upload`"
           class="avatar-uploader">
           <img v-if="teacher.avatar" :src="teacher.avatar" width="100" height="100"/>
           <i v-else class="el-icon-plus avatar-uploader-icon"/>
         </el-upload>
       </el-form-item>

       <el-form-item>
         <el-button type="primary" @click="saveOrUpdate()">保存</el-button>
       </el-form-item>
     </el-form>
   </div>
</template>

<script>
import teacherApi from '@/api/vid/teacher'
import {getBaseURL} from "@/utils";
export default {
  name: "create",
  data(){
    return {
       teacher:{
         sort: 0,
         level: 1
       },
      BASE_URL: getBaseURL()
    }
  },
  created() {
    if (this.$route.params.id){
        teacherApi.getTeacherById(this.$route.params.id)
          .then(res => {
            this.teacher = res.data
          })
    }

  },
  methods:{
    // 上传成功回调
    handleAvatarSuccess(res, file) {
      if (res.code === 200) {
        this.teacher.avatar = res.data
        // 强制重新渲染
        this.$forceUpdate()
      } else {
        this.$message.error(res.message)
      }
    },

    // 错误处理
    handleAvatarError() {
      this.$message.error('上传失败!')
    },

    // 上传校验
    beforeAvatarUpload(file) {
      const isJPG = (file.type === 'image/jpeg' || file.type === 'image/png')
      const isLt2M = file.size / 1024 / 1024 < 2

      if (!isJPG) {
        this.$message.error('上传头像图片只能是 JPG/PNG 格式!')
      }
      if (!isLt2M) {
        this.$message.error('上传头像图片大小不能超过 2MB!')
      }
      return isJPG && isLt2M
    },
    saveOrUpdate() {
      if (this.teacher.id){
        teacherApi.updateTeacher(this.teacher)
          .then(res => {
            this.$message.success('更新成功！')
            this.$router.push({path: '/vid/teacher/list'})
          })
      }else {
        teacherApi.saveTeacher(this.teacher)
          .then(res => {
            this.$message.success('添加成功！')
            this.$router.push({path: '/vid/teacher/list'})
          })
      }
    }
  }
}
</script>


<style scoped lang="scss">

</style>
